docs: def update_node_helper(source: nx.Graph, target: nx.Graph) -> None:
      """Update the nodes' data dictionaries in the target graph from the source graph.
  
      :param source: The universe of all knowledge
      :param target: The target BEL graph
      """
      for node in target:
          if node in source:
              target.nodes[node].update(source.nodes[node])